Stellar structure model in hydrostatic equilibrium in the context of f(R)-gravity

Andre, Raila and Kremer, Gilberto M (2017) Stellar structure model in hydrostatic equilibrium in the context of f(R)-gravity. Research in Astronomy and Astrophysics, 17 (12). pp. 122-131. ISSN 16744527

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Abstract

t In this work we present a stellar structure model from f(R)-gravity point of view capable to describe some classes of stars (White Dwarfs, Brown Dwarfs, Neutron stars, Red Giants and the Sun). This model was based on f(R)-gravity field equations for f(R) = R + f2R2 , hydrostatic equilibrium equation and a polytropic equation of state. We compared the results obtained with those found by the Newtonian theory. It has been observed that in these systems, where high curvature regimes emerge, stellar structure equations undergo modifications. Despite the simplicity of this model, the results weresatisfactory. The estimated values of pressure, density and temperature of the stars are within those determined by observations. This f(R)-gravity model has been proved to be necessary to describe stars with strong fields such as White Dwarfs, Neutron stars and Brown Dwarfs, while stars with weaker fields, such as Red Giants and the Sun, were best described by the Newtonian theory.

Item Type: Article
Uncontrolled Keywords: cosmology: theory — stars: general — massive — brown dwarfs — white dwarfs — neutron
Subjects: Departments at MU > Manipal Centre for Natural Sciences
Depositing User: MCNS Editor
Date Deposited: 14 Nov 2017 04:28
Last Modified: 14 Nov 2017 04:28
URI: http://eprints.manipal.edu/id/eprint/149965

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